3-3
Catalyst 2940 Switch Hardware Installation Guide
OL-6157-01
Chapter 3 Troubleshooting
Diagnosing Common Problems
No connectivity to SFP
module.
• The SFP module was
installed after the switch
was powered on.
Note By default, the
100BASE-FX port is
enabled and the SFP
module slot is disabled if
an SFP module is not
already installed when
the switch is powered on.
• Remove and reinstall the
SFP module, and reboot the
switch.
Note See the “Connecting to
an SFP Module” section
on page 2-12 and the
Cisco Small
Form-Factor Pluggable
Modules Installation
Notes (order number
DOC-7815160=) for
procedures on removing
an SFP module.
• A 100BASE-FX device is
connected to the switch.
• Remove the connection to
the 100BASE-FX device,
reinstall the SFP module,
and reboot the switch.
Switch placed in
error-disabled state after SFP
module is inserted.
Bad or non-Cisco-approved SFP
module.
Remove SFP module from the
switch, and replace it with a
Cisco-approved module. Use the
errdisable recovery cause
gbic-invalid global
configuration command to verify
port status, and enter a time
interval to recover from the
error-disable state.
See the command reference for
information about the errdisable
recovery command.
Table 3-1 Common Connectivity Problems and Their Solutions (continued)
Symptom Possible Cause Resolution
